Pump Jack Scaffolding

Polish translation: rusztowanie masztowe

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Pump Jack
A pump jack scaffold is a supported scaffold consisting of a platform supported by vertical poles and movable support brackets (see figure 24).
Brackets, braces and accessories for pump jack scaffolds must be fabricated from metal plates and angles. Two positive gripping devices are required for each bracket. Poles must be secured to structures by rigid triangular bracing or its equivalent at the bottom, top, and other points.
When it is necessary to raise the platform, crossbracing must be added about four feet on the side opposite the pump jack brace and be left in place until the pump jack has been moved and the initial brace has been reinstalled. If wood poles are used, the lumber must be straight-grained, free of shakes and large loose or dead knots and other imperfections that may reduce the strength of the wood. If two consecutive lengths are used to form the wood poles, the poles are to be connected together with the seam parallel to the bracket. If 2" x 4" lumber is used to create a pole, the splices must be strong enough to maintain the full strength of the member. Workbenches may not be used as scaffold platforms.

Pump Jack
A pump jack scaffold is a supported scaffold consisting of a platform supported by vertical poles and movable support brackets (see figure 24).
Brackets, braces and accessories for pump jack scaffolds must be fabricated from metal plates and angles. Two positive gripping devices are required for each bracket. Poles must be secured to structures by rigid triangular bracing or its equivalent at the bottom, top, and other points.
When it is necessary to raise the platform, crossbracing must be added about four feet on the side opposite the pump jack brace and be left in place until the pump jack has been moved and the initial brace has been reinstalled. If wood poles are used, the lumber must be straight-grained, free of shakes and large loose or dead knots and other imperfections that may reduce the strength of the wood. If two consecutive lengths are used to form the wood poles, the poles are to be connected together with the seam parallel to the bracket. If 2" x 4" lumber is used to create a pole, the splices must be strong enough to maintain the full strength of the member. Workbenches may not be used as scaffold platforms.